limestone - red wine spill

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That being said, if your limestone has a polished or satin-finish, the wine most likely also etched the surface of the stone, making it duller than the rest. That, depending from the finish, it could be easily rectified after you remove the staining agent from the stone. Let me know.

As for the additional sealing, it's kind of difficult. First off, certain limestones require several applications of a good-quality impregnating sealer. To the best of my knowledge, only one particular limestone (honed or tumbled travertine) can get away with one application only. How many applications were made to your stone the first sealing job around?

Second, changing type/make of impregnator is always a chanchy proposition; there's no guarantee that the second impregnator will work at its best due to the presence of the first one. Third, certain makes work best with certain stones, but poorly with certain others. There's no way of saying which imprengator would be best for your particular limestone. So, as you can see, there's not much that I can tell you for sure about the sealing of your stone. I would trhy to continue with the second one until you get, hopefully, a decent result...

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Ciao and good luck,

Maurizio Bertoli